Perhaps you should try some spelling variations:
historia americana » historia mexicana, history american, history americas
lectura del » lectura de, lecture de, lectura en
lettura del » lettura dei, lettura e
lettera del » lettera di, lettura dei

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((lectura del) OR (((lettura del) OR (lettera del)))) historia americana.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((lectura del) or (((lettura del) OR (lettera del)))) historia americana".
• Adding a wildcard symbol may retrieve word variants: ((lectura del) or (((lettura del) OR (lettera del)))) historia americana*.